It beggars belief really. I can’t think of any rational explanation for a giant green plastic cactus in Perth. A large fake gold nugget perhaps, or a lump of iron ore (or maybe a depiction of a hollowed out ex-mountain), a big ear of wheat (to continue Australia’s obsession with the ‘big [insert object here] ‘ would work, or a giant Akurbra, but cactus – I don’t get it.